Investments - Changes in Balance of Level 3 Securities (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Summary of changes in Level 3 securities
Beginning balance	$ 101,534	$ 72,680	$ 95,125	$ 62,096
Included in other comprehensive earnings (loss)	1,130	3,104	2,922	2,789
Purchases	6,995	16,069	15,093	28,379
Sales / Calls / Maturities	(8,149)	(326)	(11,630)	(1,737)
Ending balance	101,510	91,527	101,510	91,527
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - OCI	$ 1,244	$ 3,104	$ 2,899	$ 2,789